Simplifying of rules

• To: mathgroup at smc.vnet.net
• Subject: [mg33742] Simplifying of rules
• From: "Eric L. Strobel" <fyzycyst at comcast.net>
• Date: Wed, 10 Apr 2002 00:50:08 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```I got the following solution to a complicated set of trig equations (using
the following statement: soln2 = Solve[{eq6, eq7}, a] where the equations
involve trig functions of a, b and a+b ...

{{a -> -ArcCos[-Cos[b]]}, {a -> ArcCos[-Cos[b]]},
{a -> -ArcCos[Cos[b]]}, {a -> ArcCos[Cos[b]]}}

Now, by inspection it's obvious what the relationship between a & b is, but
how do I force Mathematica to simplify out all these ArcCos[Cos[]]
instances?

I guess the other question would be "How could I have avoided these
nonsimplified rules to begin with?"

- Eric.

--

Eric Strobel (fyzycyst at NOSPAM^mailaps.org)

=====================================================================
I'm always forgetting that I have short term memory loss...
=====================================================================

```

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